[#beman-optional-optional-06-or_else]
= xref:beman.adoc[beman]::xref:beman/optional.adoc[optional]::xref:beman/optional/optional-06.adoc[optional<T&>]::or_else
:relfileprefix: ../../../
:mrdocs:

Calls a function if the optional is empty.

== Synopsis

Declared in `<beman/optional/optional.hpp>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class F>
constexpr
xref:beman/optional/optional-06.adoc[optional<T&>]
or_else(F&& f) const;
----

== Description

The return type is the same as the return type of `f,` which must return an optional type.

== Return Value

* optional
* optional<T&>


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